No education means you get a new bottom rung of society who can't read and write and can thus endager others, especially as they will likely be poor or join gangs or commit crimes due to ignorance.
Also, they'll cost quite a bit of social security from actual taxpayers.

I have come across many people who actually did go to school yet can't read or write , also lots of people in "gangs" , plenty of university educated criminals , and lots of educated wasters on welfare .
Yet I didn't bother with school , can read and write , didn't join a gang , am not a criminal and the only cost I put on social security payments from actual taxpayers was statuatory sick pay when I broke a leg at work . Now the same can be said for my father , apart from the broken leg but you can replace that with the fact that he got the usual social security payments when he reached 65 .
Perhaps you need a narrower brush if you want to paint a picture .